Support for implement retainers



Sept. 17, 1929. J rrs 1,728,601

'- SUPPORT FOR IMPLEMENT RBTAINERS Filed April 19, 1927 [WI :4. 1 0 L 0w 0 Y J Y D Y f W M BY H ."2, 111,5 ATT RNEY,

Patented Sept. 17, 1929 UNITE D STATES eaten? oFFicE I JESSE DITSON, on LITT ETON, oononeno, ssronon ro'InennsoLL-n nn COMPANY,

or JERSEY CITY, NEW JERSEY, A conrone rron or JE SE sm ronr i on IMPLEMENT- nnrernnns Application filed April 19,

This invention relates to drill Sharpeners but more particularly to a support for a re tainmg sprmg used for retaining the tormmg dolly in operative position in the hammer cylinder of the drill sharpener One object of the invention is to facilitate the operation of securing the dolly retainer in operative position.

Other objects will appear hereinafter, and

away of the hammer cylinder showinglthe dolly retainer in operative position, v I Figure 3is a view similar to Figure 1 illustrating the manner in which tension is inducedin the retainer springs and a Figure 4- is a sectional plan view taken through Figure 3 on the lined- 4: looking in the direction indicated by the arrows.

Referring to the drawings, A designates a portion of the casing; of a drill sharpener having a support '13 onflwhich is disposed slidably a hammer cylinder C. Thefmeans for securing the hammer cylinder 0 inthe' desired position with respect to the support B are not shown in the drawingabut it is to be understood that any suitable and convenient means may be provided for this purpose. i

Disposed within the cylinder C is'a reciprocatory hammer piston D adapted to be actuated by pressure fluid controlled and conveyed to the cylinder C in any well known manner. The hammer piston D has a -forward reduced extension E which cooperates slidably with a washer F in the front end. of the cylinder and extends into a bore in a front head H supported by the cylinder C. I

The forward portion of the, bore G of i the front head H is preferably reduced some- 1927." serial' no; 184 917.

ing dolly J adapted .to form the cutting face of the working implement, such as a drill steel K supported by the casing A. The rearwardportion of the dolly J extends into the enlarged portion of the bore G and is exposed to thefblows of the hammer pis- 0011 Y f t i Carriedby the cylinder C is'a carriage L having a pair ot forwardly extending arms (1* preferably parallel with respect to each othercand located at opposite sides of the carriage L. The carriage L in this instance is secured to the cylinder by means ofbolts P and at their forward ends and on the inner surfaces thereof are formed lugs Q, having inclined groovesR. The arms 0 are further provided on their inner surfaces with trunnions Spreferably located at a point above the grooves R ofthe lugs Q. The end surfaces T of the trunnions S are in this instance tapered or inclinedand in theperiphery ofthe trunnions S are formed concave 'annular grooves U for engagement with the outer coils of lateral springrnernhers V formed integrally in this instance with a retainer yoke W adapted to engage a slot X in the dolly J. The outer. coils of the springs V preferably have terminals Y which. when the springs are in engagement with the trunnions S, R of the lugrsQ. t

Any suitable means inny. be prollded forcing'the springs V intoengagement with the trunnions S. nthe present" instance, the means provided fort-his purpose consists of a projection Z located onthe side of the fcasingA'and having a surface 1?) lying in a plane somewhat above thelongitudinal axes of theltrunnions S.

In practice, the dolly J is first placed in the front head H in such a position that the slot X is pointed downwardly to receive the yoke 7 and the springs V of the yoke will then abut the lugs Q, in the manner illustrated inFigzure 1. After the dolly and the yoke are thus disposed, the hammer cylinder Cmaybe advanced inthe direction of the-casing A with sufficient force to ens-c able the projection to force vthe springs so will lie in the grooves V into the carriage L. In this way, the springs V will be guided into engagement with the grooves U by the inclined surfaces T of the trunnions S, and the spring terminals Y will lie in the grooves R at a suit able angle to the yoke so that suflicient tension will be set up in the springs to enable the yoke IV to promptly retract the dolly J' a ter each blow of the piston.

By means of this invention the operation of inserting the yoke N in the carriage L has been greatly simplified, and the chances of injury to the operator have been practically eliminated.

I claim:

1. In a drill sharpener, the combination of a casing, a hammer cylinder carrying a forming dolly, a carriage on the cylinder, a spring retaining the dolly in operative posi tion, there being means on the carriage adapted'to engage the spring'for holding said spring in operative position, and means for guiding the spring into engagement with the first said means whenever the spring is forced into contact with the casing.

2. In a drill sharpener, the combination of a casing, a hammercylinder carrying a forming dolly, a carriage carried by the cylinder, means comprising a yoke withintegral spring members for retaining the the dolly in operative position, there being trunnions on the carriage adapted for engagement with ends of the springs to hold the yoke in operative position, and said carriage having means for guiding the springs into engagement with the trunnions.

3.111 a drill sharpener, the combination of a casing, a hammer cylinder slidable relatively to the casing, a carriage secured to the cylinder, means comprising a yoke with integral coil springs for retaining the dolly in operative position, there being trunnions on the carriage engaging end' coils of the springs to maintain the yoke in operative position, and inclined surfaces on the trunnions to guide the springs into engagement with the trunnions whenever the carriage is advanced to force the springs into contact the springs into the grooves upon the application of pressure against the springs by the projection.

5. In a drill sharpener, the combination of a casing having a projection, a hammer cylinder slidable relatively to the casing, a

forming dolly, a carriage movable with the cylinder having a pair of arms, means comprising a yoke and integral springs for retaining the dolly in operative position, there being trunnions on the inner surfaces of the arms, said trunnions having external annular grooves to engage end coils of the springs, there being means on the arms supporting terminals of the springs to induce tension in said springs, and inclined end surfaces on the trunnions to guide the springs into engagement with the grooves whenever the sprin s are pressed against the projection.

6. In a drill sharpener, the combination of a fixed member. a movable member carrying a working implement, yieldable means for retaining the working implement in the movable member, and means carried by the movable member adapted to be forced into engagement with the yieldable means whenever said yieldable means are pressed against the fixed member by the movable member to place the yielding means in operative position to maintain the working implement in the moving member.

7. The combination of a drill sharpener and a support for the work, of a hammer cylinder carrying a forming dolly, a carriage carried by the cylinder, a spring for retaining the dolly in operative position and adapted to be placed in front of the carriage preparatory to the movement of the same and in engagement with the dolly, and means for guiding the spring into the operative position as the carriage moves toward the support to retain the dolly in the operative position.

8. The combination with a drill sharpener having a carriage and a support for the work, of a hammer cylinder carrying a forming dolly, a spring for retaining the dolly in position, there being means on the carriage for'holding the spring in operative position to'reta-in the dolly, said means being adapted to be pressed into engagement with the spring as the carriage is moved toward the support for locking the spring in an operative position.

In testimony whereof I have signed this specification.

JESSE DITSON. 

